/**
 * *****************************************************************************
 * Copyright (c) 2011 GigaSpaces Technologies Ltd. All rights reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 * *****************************************************************************
 */
package com.kedacom.demo.sigar.cloudify;

import com.kedacom.demo.sigar.util.SigarUtil;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.hyperic.sigar.Sigar;

/**
 * ***********
 * Monitor implementation that collects operating system metrics using SIGAR.
 *
 * @author barakme
 * @since 2.1.0
 *
 */
public class ProcessMonitor implements Monitor {

    private final Sigar sigar = SigarUtil.getSigarInstance();

    @Override
    public Map<String, Number> getMonitorValues(List<Long> pids)
            throws MonitorException {

        if (pids.isEmpty()) {
            return new HashMap<String, Number>();
        } else if (pids.size() == 1) {
            final MonitorData data = new MonitorData(sigar, pids.get(0));
            final Map<String, Number> map = data.getDataMap();
            return map;
        } else {
            // Collect data for all processes, add PID to key name, and return all in one map.
            final Map<String, Number> allProcessesMap = new HashMap<String, Number>();
            for (final Long pid : pids) {
                final MonitorData data = new MonitorData(sigar, pid);
                final Map<String, Number> map = data.getDataMap();
                final Set<Entry<String, Number>> entries = map.entrySet();
                final String postfix = "-" + pid;
                for (final Entry<String, Number> entry : entries) {
                    allProcessesMap.put(entry.getKey() + postfix, entry.getValue());
                }

            }

            return allProcessesMap;

        }

    }
}
